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Total-iron complexing flow cell with high open-circuit voltage

A technology of flow battery and iron complex, which is applied in the field of all-iron complex flow battery to achieve the effects of abundant reserves, increasing open circuit voltage and reducing battery cost

Inactive Publication Date: 2014-04-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to prepare an all-iron complex flow battery in which both positive and negative electrode electrolytes use iron complex aqueous solution, which has a high open circuit voltage, no cross-contamination and hydrogen evolution, thereby achieving a higher battery efficiency

Method used

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  • Total-iron complexing flow cell with high open-circuit voltage
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  • Total-iron complexing flow cell with high open-circuit voltage

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Weigh 2.7801g FeSO 4 .7H 2 O crystals dissolved in deionized water, in molar ratio FeSO 4 .7H 2 O:Phen:H 2 SO 4 Add Phen and 98%H for 1:3:10 2 SO 4 , electromagnetically stirred until dissolved, and configured as 100mL positive electrode electrolyte, wherein the concentration of Fe(II) / Phen complex is 0.1mol / L. Weigh 0.9997gFe 2 (SO 4 ) 3 .xH 2 O crystals dissolved in deionized water, in molar ratio Fe 2 (SO 4 ) 3 .xH 2 O:TEA:NaOH:NaCl is 1:16:20:8 Add TEA, NaOH and NaCl, electromagnetically stir until dissolved, configure 100mL negative electrode electrolyte, wherein the concentration of Fe(III) / TEA complex is 0.05mol / L. Put 60mL of positive and negative electrolytes in 2 liquid storage tanks respectively, according to figure 1 The shown assembly is an all-iron complex flow battery. Among them, the size of graphite felt electrode is 2×2×0.5cm, and the effective area of ​​Nafion117 membrane is 4cm 2 . Carry out the battery charge and discharge test, ...

Embodiment 2

[0030] Weigh 5.5602g FeSO 4 .7H 2 O crystals dissolved in deionized water, in molar ratio FeSO 4 .7H 2 O:Phen:H 2 SO 4Add Phen and 98%H for 1:5:5 2 SO 4 , electromagnetically stirred until dissolved, and configured as 100mL anode electrolyte, wherein the concentration of Fe(II) / Phen complex is 0.2mol / L. Weigh 7.9976gFe 2 (SO 4 ) 3 .xH 2 O crystals dissolved in deionized water, in molar ratio Fe 2 (SO 4 ) 3 .xH 2 O:TEA:NaOH:NaCl is 1:5:7.5:1 Add TEA, NaOH and NaCl, electromagnetically stir until dissolved, configure 100mL negative electrode electrolyte, wherein the concentration of Fe(III) / TEA complex is 0.4mol / L. Put 35mL of positive and negative electrolytes in two liquid storage tanks respectively, according to figure 1 The shown assembly is an all-iron complex flow battery. Among them, the size of graphite felt electrode is 2×2×0.5cm, and the effective area of ​​Nafion115 membrane is 4cm 2 . Carry out the battery charge and discharge test, the charge and...

Embodiment 3

[0032] Weigh 11.1204g FeSO 4 .7H 2 O crystals dissolved in deionized water, in molar ratio FeSO 4 .7H 2 O:Phen:H 2 SO 4 Add Phen and 98%H for 1:5:2.5 2 SO 4 , electromagnetically stirred until dissolved, and configured as 100mL positive electrode electrolyte, wherein the concentration of Fe(II) / Phen complex is 0.4mol / L. Weigh 7.9976gFe 2 (SO 4 ) 3 .xH 2 O crystals dissolved in deionized water, in molar ratio Fe 2 (SO 4 ) 3 .xH 2 O:TEA:NaOH:NaCl is 1:5:7.5:1 Add TEA, NaOH and NaCl, electromagnetically stir until dissolved, configure 100mL negative electrode electrolyte, wherein the concentration of Fe(III) / TEA complex is 0.4mol / L. Put 35mL of positive and negative electrolytes in two liquid storage tanks respectively, according to figure 1 The shown assembly is an all-iron complex flow battery. Among them, the size of graphite felt electrode is 2×2×0.5cm, and the effective area of ​​Nafion115 membrane is 4cm 2 . Carry out the battery charge and discharge tes...

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Abstract

The invention discloses a total-iron complexing flow cell with high open-circuit voltage. The total-iron complexing flow cell with high open-circuit voltage is characterized in that iron complexing water solutions are adopted for the positive electrode electrolyte and the negative electrode electrolyte. Iron ions and different types of complexing agents form iron complexing electrolyte, that is, ferrous / phenanthroline complexing electrolyte is adopted for the positive electrode, and ferric iron / triethanolamine complexing electrolyte is adopted for the negative electrode, so that the electrode potentials of ferrous / ferric iron electric pairs respectively move toward the positive direction and the negative direction. The total-iron complexing flow cell consisting of the two iron complexing electrolyte has relatively high cell open-circuit voltage. The iron complex also can inhibit the hydrogen evolution reaction, prevent cross pollution of the electrolyte solution comprising different types of ions, and improve the efficiency of the flow cell.

Description

technical field [0001] The invention relates to an all-iron complex flow battery with high open-circuit voltage, which is an all-iron complex flow battery in which both positive and negative electrode electrolytes use an aqueous iron complex solution to increase the open-circuit voltage of the flow battery. Background technique [0002] Oxidation-reduction flow batteries store electrical energy in electrolytes with oxidation-reduction activity, and are an emerging large-scale energy storage technology. It has the advantages of fast start-up speed, large energy storage capacity, high energy efficiency, safety and reliability, etc., and can be widely used in energy storage and power peak regulation of renewable energy power generation systems. [0003] Electrolyte is the key technology that determines the energy storage capacity, efficiency, cost and stability of flow batteries. The electrolyte system currently used is mainly divided into: [0004] (1) Electrolytes of differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/08H01M8/18
CPCY02E60/50H01M8/08
Inventor 吴雪梅贺高红高秋艳韩玥张代双甄栋兴姜晓滨
Owner DALIAN UNIV OF TECH
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